Accountable Care Organizations I. A legal entity that is recognized and authorized under applicable state, federal, or tribal law, is identified by a number issued by the Joint Commission. II. A legal entity that is recognized and authorized under applicable state, federal, or tribal law, is identified by a Taxpayer Identification Number. III. A legal entity that is recognized and authorized under applicable state, federal, or tribal law, is identified by a provider's social security number IV. A legal entity that is recognized and authorized under applicable state, federal, or tribal law, is identified by a Medical License Number